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Can I use exceptions for validation Some developers get excited once they see how many fine-grained exception types Hibernate can throw. This can lead you down the wrong path. For example, you may be tempted to catch the ConstraintViolationException for validation purposes. If a particular operation throws this exception, why not display a (customized depending on the error code and text) failure message to application users and let them correct the mistake This strategy has two significant disadvantages. First, throwing unchecked values against the database to see what sticks isn t the right strategy for a scalable application. You want to implement at least some data-integrity validation in the application layer. Second, all exceptions are fatal for your current unit of work. However, this isn t how application users will interpret a validation error they expect to still be inside a unit of work. Coding around this mismatch is awkward and difficult. Our recommendation is that you use the fine-grained exception types to display better looking (fatal) error messages. Doing so helps you during development (no fatal exceptions should occur in production, ideally) and also helps any customer-support engineer who has to decide quickly if it s an application error (constraint violated, wrong SQL executed) or if the database system is under load (locks couldn t be acquired).

The junior software engineers are attempting to access resources that are located on a private internal network through the Internet. Because private network IDs are not visible from the Internet, you must create a special port, mapping the private IP address and private port infor mation with the public IP address and public port number.

In the following case scenarios, you apply what you have learned in this chapter. You can find answers to these questions in the Answers section at the end of this book.

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Programmatic transaction demarcation in Java SE with the Hibernate Transaction interface keeps your code portable. It can also run inside a managed environment, when a transaction manager handles the database resources. Programmatic transactions with JTA A managed runtime environment compatible with Java EE can manage resources for you. In most cases, the resources that are managed are database connections, but any resource that has an adaptor can integrate with a Java EE system (messaging or legacy systems, for example). Programmatic transaction demarcation on those resources, if they re transactional, is unified and exposed to the developer with JTA; javax.transaction.UserTransaction is the primary interface to begin and end transactions. The common managed runtime environment is a Java EE application server. Of course, application servers provide many more services, not only management of resources. Many Java EE services are modular installing an application server

2. You decide to deploy Active Directory by adding an additional Windows Server 2003 server to the internal network of each hub office. You run dcpromo on one of the servers and create a single forest. When you attempt to upgrade another Windows Server 2003 server located in a different hub office to join this forest, you are unable. Why

You are a database developer for Wide World Importers. You are responsible for a sales database for the company. This database is normalized to third normal form. An application developer who is fairly new to SQL Server is developing a Web application that retrieves information from the database. Although he feels confident in his ability to use his reference tools to develop the required queries, he has asked for a set of sample queries from which he can extrapolate and build the required queries. You need to provide a Web developer with a sampling of queries demonstrating the required functionality. The application needs to include queries that return information on products (including their names and descriptions) that were imported based on the date the order was placed or completed. The sales department would like to provide an option in the application to display dates in different formats. In addition, the salespeople would like to be able to sort data based on the number of days between when the order was placed and when it was completed. Finally, users should be able to return data from different time periods, such as the past month, quarter, or year. Answer the following question for your manager: What functions and clauses should you include in the sample queries to provide the application developer with samples to help him with his application development

isn t the only way to get them. You can obtain a stand-alone JTA provider if managed resources are all you need. Open source stand-alone JTA providers include JBoss Transactions (http://www.jboss.com/products/transactions), ObjectWeb JOTM (http://jotm.objectweb.org), and others. You can install such a JTA service along with your Hibernate application (in Tomcat, for example). It will manage a pool of database connections for you, provide JTA interfaces for transaction demarcation, and provide managed database connections through a JNDI registry. The following are benefits of managed resources with JTA and reasons to use this Java EE service:

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